I suspect they could increase US traffic 50% without a problem, maybe even 100%.
I find the flight choices are always a trade-off between cost and convenience. Coming from the east coast, connecting in ATL and getting there in the afternoon is terrific, as is the schedule going home. The new Aruba Airllines flights a very carefully scheduled to make same-day travel impossible, both directions. I'm not going to make an extra connection in Aruba, with an overnight, each direction, for nearly the same price.
My favored solution is JetBlue from FLL. I believe in the tooth fairy and the Easter bunny, too..